Improvement in the manufacture of zinc-white



SGARDNBR MANUPACTURE 0F ZINC WHITE.

NM2-,6113, v Patentedfmafgzv,1855,'

UNITED STATES PATENT Clinics'.

sMITH GARDNER, oFNEW YoRK, N. Y., AssIeNoR To AMERICAN WHITE ZINC COMPANY,YASSIGNORS TO (WARD KEIILOGG.A i

cHfAs. T. PIERsoN, AssIGNoR To ED- Specication forming part of Letters Patent No. 12,6 I3. dated March 27, 1855.

To all whom it may concern:

-Be it known that I, -SMITII GARDNER, of the city, county, andState of New York, have invented anew and useful Apparatus for the Manufacture of White Zinc; yand I do hereby declare the following to'be a full, clear-,and

` exact description thereof, referencebeing had `to the accompanying drawings, in which- Figure l is aplan. Fig. 2 is alongitudinal sectional' elevation'on the linea a of Fig. 1. Fig. 3 is a verticalsection on the line bb, Fig. Ill; Fig. 4 is the blower attached by pipe p of Myl invention consists in the method of vaporizing 'or subliming spelter 'andcharging it with oxygen, so as tomake the pigment known as white zinc or the oxide of Zinc, g v l The construction is as-follows: j is the rechamber, placed on one side and extending from back to front of the oven, as clearly shown by the plan. a reverberatory-furnace Iirechamber. Be-

" tween the oven 'or hearth o, upon which the spelteh is placed, and the fire-chamber there is a partition-wall, c, with a row of apertures,

d, in it, through which the fire passes into the oven, and on the opposite side of the ov'en seen in Fig. l, at the end of which latter chamber there is an opening, into which pipe p is iitted, that extends back some four hundred feet and terminates in a fan-blower, (shown at Fig'. 4,) the case of" which has a pipe, q, leading from itinto a chamber where the white zinc is lodged, as will be presently described. Over the center of chamber y there is a chimney, z, erected, opening into the top of said chamber, through which the' impure This construction is likel gases of combustion escape while the coal is kindling or when it is.' removed. y The top of this chimney has` a Vhinged damper, m, upo it, and `there is a valve, c, in the pipe p, tobe closed and opened when required during the process.y There is an air-pipe, h, that enters the chamber y near the rear end, and runber, said holes being directly below-the apertures through from the oven before named, and through which the vaporized zinc passes.

The mode of working this furnace and its operation are as followsz' 'A fire is made of anvalve o in pipe p beingclosed, andthe hinged `damper m in the chimneyopen. lrangement the snlphurousand other impure gases evolved in the combustion of the .coal

are expelled andthe furnace and oxidizingchamber at the proper heat, the damper m Lis charged withA spelter, which isthere vaporized without being oxidized, as the atmosphere is excluded therefrom.

the oxidizing-chamber w, where 'it meets a the operation of the fan-blower is drawn in through the pipe h and holes i, with which it is intimately intermingled, and at which point the vaporizedfzinc receives its proper charge of oxygen for the purposes of the manufacture, and the oxide thus formed passes through the only place of exit-pipe p-and isv drawn into thefan-`blower and discharged through pipe q into` the receiving-chamber, which is formed in the usual way-a frame vcovered while the zinc-white is retained. After one closed and the dainperm opened. The iire is then renewed by a new charge of coal, from cle of white zinc are driven ofil up the chim-y ney, and the coal is thoroughly ignited, when another charge of spelter is introduced and ning forward opens into the chambera: through i a series of holes, i, in the bottom of the chamy thracite or other coal in the lire-chamber, the

By this arare driven off. .When all' the impure gases is closed and the valve c opened. The oven The vapor thus v formed passes'off through the openings cinto current of heated atmospheric air,"which byv with cloth, through which the gases can pass,

charge has been worked off, thevalve o is which the impure gases injurious to the arti 'I manufactured in the same way. These a1ternate riugs and charges of zinc are continued during the manufacture.

Having thus fully described my improvements in the manufacture of the white oxide of A zinc, what I claim therein as new, and desire t0 secure by Letters Patent, is-

lhe ccmoinatiou of the fire-chamber, the

vapcrizng chamber or oven, and. the oxidizing chamber7A substantlally as herein described.

SMITH GARDNER.

Witnesses:

THQS. E. WARREN, J Aeo HATsmLL. 

